function s1_hello(){
 echo "hello, world!";
}

function s2_tell_who_i_am(){
 whoami
}

function s3_which_distro_do_i_use(){
 cat /etc/*release | grep "^NAME"
}

function s4_view_my_cpu_arch(){
 uname -m
}

function s5_show_first_scsi_disk_size(){
 lsblk -l | grep disk | grep '^sda'|awk '{print $4 + 0}'
}

function s6_show_main_memory_size_in_megabytes(){
 free -m | grep "Mem:" |awk '{print $2}'
}

